I got an email that Aim Surplus had Glock 22 police trade ins for $300. I'm sure other places are similar or soon will be.
Add one of the Glock brand belt slide holsters and their mag pouch for about 25 bucks and that is probably a rig that is better than a majority of gun owners would show up with. I'd be tempted to load them with something like the 135 gr Border Patrol load to keep recoil down.
In the past I've ran into a couple of older 870 Wingmasters cheap because they didn't have a vent rib,were full choked and not photogenic. Solid slick guns after cleanup, shortening the barrel and adding a sling.
That's two gun and extras for low price AR type money.